Method – Chop the onion and fry it in skillet until transparent (use very little oil) stirring occasionally. Some browning is good. Sprinkle with vinegar and soy sauce (about 1 tbsp of each, feel free). Ground some pepper and leave on medium-low for a bit to evaporate most of liquid. Squeeze some lemon juice right before serving. Meanwhile pour handful of peas into soup bowl or plate, then place some tuna chunks (split them a bit with fork). Voila! You’re done, now just add hot onion over tuna and top with parsley.
Recipe from: http://www.opensourcefood.com/people/Qarpon/recipes/quick-tuna-on-peas-snack
Changes were made. http://creativecommons.org/licenses/by-sa/3.0/